EECE-2112 Lecture 2: Current, Voltage and PSC
23 Jan 2019
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Charge in motion and separation of charge results in current and voltage. =energy per unit charge created by separating + and - charge tow ddge. Current is described in terms of magnitude and direction. Properties: it has only two terminals, it can be mathematically described in terms of voltage and/or current, it cannot be subdivided p power tddfp wattcww joules. ci. 1w isis chainrule p lpwiyiv dd vi alwaysgoingto betrue. Note: power can be positive or negative, depending on signs of v and i i. e. an element can generate power or absorb power absorbing p > 0 p < 0 generating. Step 1: given an ideal circuit element, de ne the direction of i to ow into (+) terminal, and out of (-) terminal. By the psc, we de ne positive current (i > 0) in the direction of positive charge ow (note: psc is universal) For any circuit, conservation of energy applies i zp o or.
